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| Atmospheric Oxygen Leaching Process for Polymetallic Complex Copper Mine |
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Received:March 13, 2023
Revised:March 19, 2023
Accepted:March 24, 2023
Published Online:June 16, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.07.005 |
| KeyWord:polymetallic complex copper ore; atmospheric oxygen leaching; sulfuric acid |
| Author | Institution |
| WU Jian-hui |
中南大学冶金与环境学院 |
| YAN Run |
中南大学 |
| LI Dan |
中南大学冶金与环境学院 |
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| Abstract: |
| Dilute sulfuric acid and industrial oxygen (99%) were used as leaching agent and leaching aid respectively, under atmospheric pressure to study the effects of sulfuric acid concentration, ratio of liquid to solid, leaching temperature, oxygen flow rate and leaching time on extraction efficiency of valuable metals copper, iron and zinc in polymetallic complex copper ore by single factor experiments. The results show that the leaching rate of copper, iron and zinc is 99.97%, 32.92% and 64.79% respectively under the optimum conditions including H2SO4 concentration of 1.00 mol/L, ratio of liquid to solid of 12 mL/g, reaction temperature of 85 ℃, oxygen flow rate of 0.3 L/min, and reaction time of 8 h, and the leaching rate of lead is very low. The leaching residue is mainly composed of lead sulfate, sphalerite, pyrite, galenite and elemental sulfur. The reasons for the low leaching rate of zinc and iron are analyzed. The pH value of the leaching solution between 0.5 and 0.6 is found to be beneficial to enrichment and recovery of copper in the subsequent leaching solutions. |
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